Nikon Camera N90 User Manual
Page 183
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Reference: Available maximum aperture for each film
speed
ISO film speed
25
50
100
200
400
800
1000
f/2,8
f/3.3
f/4
f/4,8
f/5.6
f/6.7
f/7.1
As film speed increases by one step, available maximum aperture is stopped
down by 1/2 f/stop. If you are using a lens with a maximum aperture smaller
than listed, of course, the automatically controlled aperture range is from the
lens maximum aperture to its minimum aperture (i.e., its entire range).
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